/*
 * Copyright (C) 2008 TranceCode Software
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 * 
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 *
 * $Id$
 */
package org.trancecode.rdf.base;

import org.trancecode.rdf.AbstractLiteral;
import org.trancecode.rdf.Literal;
import org.trancecode.rdf.UriReference;

import com.google.common.base.Preconditions;


/**
 * Base {@link Literal} implementation.
 * 
 * @author Herve Quiroz
 * @version $Revision: 3842 $
 */
public class ImmutableLiteral extends AbstractLiteral
{
	private final UriReference type;
	private final String stringValue;
	private int hashCode;


	public ImmutableLiteral(final String stringValue)
	{
		this(null, stringValue);
	}


	public ImmutableLiteral(final UriReference type, final String stringValue)
	{
		super();
		Preconditions.checkNotNull(stringValue);
		this.type = type;
		this.stringValue = stringValue;
	}


	@Override
	public UriReference type()
	{
		return type;
	}


	@Override
	public String stringValue()
	{
		return stringValue;
	}


	@Override
	public int hashCode()
	{
		if (hashCode == 0)
		{
			hashCode = super.hashCode();
		}

		return hashCode;
	}

	// TODO factory
}
